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CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($)
$ in Thousands
Total
Cumulative Effect Period Of Adoption Adjustment [Member]
Class A and B Common Stock [Member]
Additional Paid-in Capital [Member]
Purchase Price Of Excess Of Predecessor Basis, Net Of Tax [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect Period Of Adoption Adjustment [Member]
Accumulated Other Comprehensive Income [Member]
Treasury Stock [Member]
Beginning Balance at Dec. 31, 2017 $ 769,872   $ 419 $ 173,011 $ (15,458) $ 870,716   $ (194) $ (258,622)
Beginning Balance (in shares) at Dec. 31, 2017     41,887,088           (7,777,722)
Stock tendered for payments of withholding taxes (4,270)               $ (4,270)
Stock tendered for payments of withholding taxes (in shares)                 (87,381)
Issuance of restricted stock awards, net of forfeitures       (14,271)         $ 14,271
Issuance of restricted stock awards, net of forfeitures (in shares)                 434,020
Share-based compensation expense 13,480     13,480          
Net income 201,740         201,740      
Foreign currency translation adjustment 12             12  
Ending Balance at Dec. 31, 2018 980,834 $ (26) $ 419 172,220 (15,458) 1,072,456 $ (26) (182) $ (248,621)
Ending Balance (in shares) at Dec. 31, 2018     41,887,088           (7,431,083)
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201602Member         us-gaap:AccountingStandardsUpdate201602Member    
Purchase of treasury shares (24,998)               $ (24,998)
Purchase of treasury shares (in shares)                 (626,320)
Stock tendered for payments of withholding taxes (3,984)               $ (3,984)
Stock tendered for payments of withholding taxes (in shares)                 (98,260)
Issuance of restricted stock awards, net of forfeitures       (8,869)         $ 8,869
Issuance of restricted stock awards, net of forfeitures (in shares)                 284,775
Share-based compensation expense 16,286     16,286          
Net income 107,171         107,171      
Foreign currency translation adjustment (4)             (4)  
Ending Balance at Dec. 31, 2019 $ 1,075,279   $ 419 179,637 (15,458) 1,179,601   (186) $ (268,734)
Ending Balance (in shares) at Dec. 31, 2019     41,887,088           (7,870,888)
Purchase of treasury shares (in shares) (148,242)                
Stock tendered for payments of withholding taxes $ (7,963)               $ (7,963)
Stock tendered for payments of withholding taxes (in shares)                 (148,242)
Issuance of restricted stock awards, net of forfeitures       (10,632)         $ 10,632
Issuance of restricted stock awards, net of forfeitures (in shares)                 344,046
Share-based compensation expense 17,053     17,053          
Net income 73,559         73,559      
Foreign currency translation adjustment (5)             (5)  
Ending Balance at Dec. 31, 2020 $ 1,157,923   $ 419 $ 186,058 $ (15,458) $ 1,253,160   $ (191) $ (266,065)
Ending Balance (in shares) at Dec. 31, 2020     41,887,088           (7,675,084)